Bell Housing: Service and Repair

Flywheel Housing Replacement

Special Tools

J-37228 - Seal Cutter

For equivalent regional tools, refer to Special Tools (Special Tools).

Removal Procedure

1. Remove the transmission. Refer to Transmission Replacement (Transmission Replacement).
2. Remove the engine cover. Refer to Engine Cover Replacement (Service and Repair).
3. Remove the upper oil pan. Refer to Upper Oil Pan Replacement (Upper Oil Pan Replacement).
4. Remove the left side exhaust pipes. Refer to Exhaust Manifold Outlet Pipe Replacement - Left Side (Exhaust Manifold Outlet Pipe Replacement - Left Side).
5. Remove the right side exhaust pipe. Refer to Exhaust Manifold Outlet Pipe Replacement - Right Side (Exhaust Manifold Outlet Pipe Replacement - Right Side).




6. Remove the turbocharger oil return pipe (1) nuts (2) and studs (3) from the top of the flywheel housing.
7. Remove the engine gas recirculation (EGR) cooling pipe bolt (4).




8. Remove the oil cooler adapter (1) nuts (2) and studs (3) from the side of the flywheel housing.




9. Remove the cover plate (1) and bolts (2) from the flywheel housing.




10. Remove the flywheel bolts (1), washer (2), flexplate (3) and flywheel (4).




11. Remove the 17 flywheel housing bolts (1) and separate the flywheel housing from the cylinder block using the J-37228 - cutter.
12. Remove the rear main seal. Refer to Crankshaft Rear Oil Seal Removal (5. Crankshaft Rear Oil Seal Removal).
13. Clean and inspect the engine flywheel housing. Refer to Engine Flywheel Cleaning and Inspection (52. Engine Flywheel Cleaning and Inspection).

Installation Procedure

1. Install the rear main seal. Refer to Crankshaft Rear Oil Seal Installation (127. Crankshaft Rear Oil Seal Installation).
2. Install NEW gaskets to the flywheel housing for the turbocharger oil return pipe and oil cooler adapter.
3. Apply a 2-3 mm (1/8 in) wide by 0.5-1.5 mm (1/16 in) high bead of sealant GM P/N 12378521 (Canadian P/N 88901148) to the engine block mating surface.
4. Install the flywheel housing to the cylinder block.





Caution: Refer to Fastener Caution (Fastener Caution).

5. Install the flywheel housing bolts (1) and tighten to 95 Nm (70 lb ft).
6. Install the flywheel. Refer to Engine Flywheel Installation (128. Engine Flywheel Installation).




7. Install the oil cooler adapter (1) studs (3) to the flywheel housing, if necessary. Tighten the studs to 10 Nm (89 lb in).
8. Install the oil cooler adapter nuts (2) to the side of the flywheel housing and tighten to 25 Nm (18 lb ft).
9. Install the engine gas recirculation (EGR) cooling pipe. Refer to Exhaust Gas Recirculation Valve Cooler Replacement (Exhaust Gas Recirculation Valve Cooler Replacement)




10. Install the turbocharger oil return pipe studs (3), if necessary. Tighten the studs to 10 Nm (89 lb in).
11. Install the turbocharger oil return pipe nuts (2) and tighten to 25 Nm (18 lb ft).
12. Install the cover plate (1) and bolts to the flywheel housing.
13. Install the upper oil pan. Refer to Upper Oil Pan Replacement (Upper Oil Pan Replacement).
14. Install the left side exhaust pipes. Refer to Exhaust Manifold Outlet Pipe Replacement - Left Side (Exhaust Manifold Outlet Pipe Replacement - Left Side).
15. Install the right side exhaust pipe. Refer to Exhaust Manifold Outlet Pipe Replacement - Right Side (Exhaust Manifold Outlet Pipe Replacement - Right Side).
16. Install the engine cover. Refer to Engine Front Cover Replacement (Service and Repair).